/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 *@filename:  item/cache_row.h
 */

#ifndef COLLAPSAR_ITEM_CACHE_ROW_H
#define COLLAPSAR_ITEM_CACHE_ROW_H

#include <stdint.h>
#include <item/cache.h>

class Item_cache;
class Item;
class Send_field;

class Item_cache_row: public Item_cache
{
  Item_cache  **values;
  uint32_t item_count;
  bool save_array;
public:

  Item_cache_row()
  :Item_cache(), values(0), item_count(2), save_array(0) {}

  /*
    'allocate' used only in row transformer, to preallocate space for row
    cache.
  */
  bool allocate(uint32_t num);
  /*
    'setup' is needed only by row => it not called by simple row subselect
    (only by IN subselect (in subselect optimizer))
  */
  bool setup(Item *item);
  void store(Item *item);
  void illegal_method_call(const char * method_name);
  void make_field(Send_field *field);
  double val_real();
  int64_t val_int();
  String *val_str(String *val);
  my_decimal *val_decimal(my_decimal *val);

  enum Item_result result_type() const;

  uint32_t cols();
  Item *element_index(uint32_t i);
  Item **addr(uint32_t i);
  bool check_cols(uint32_t c);
  bool null_inside();
  void bring_value();
  void keep_array();
  void cleanup();

};

#endif /* _ITEM_CACHE_ROW_H */
